Rock drill



vSept. 28; 1943. -c. F. osGooD ROCK DRILL Original Filed May '7, 1941 2 Sheets-Sheet 1 aww?? In [www2/Low.' .67242126 91.7 syood Reissued Sept. 28, y1,9413

Re. l22,3811?.

RO CK DRILL Charles F. Osgood, Claremont, N. H., assignor to Sullivan Machinery Company, a corporation of l Massachusetts Original No. 2,309,077,

Serial No. 392,317, May 7, 1941.

dated January 19, 19313,y

Application for reissue August 4, 1943, Serial No. 497,405

(ci. c55- 45) 17 Claims.

This invention relates to rock drills, -and more particularly, but not exclusively, to improvements in supporting, guiding and feeding means for a hammer rock drill of the mounted drifter type.

An object of this invention is to provide an improved rock drill supporting, guiding and feeding means whereby the drill hammer motor may be supported, guided and fed in an improved manner. Another object is to provide an improved adjustable supporting and guiding means for a drill hammer motor whereby with an extremely compact structure, a relatively long range :if feed may be obtained. A further object is to provide an improved drill guide adjusting means and drill feeding means wherein elementsof the guide adjusting means cooperate with elements of the drill feeding means in an improved-manner. A still further object is to provide an improved drill feeding and guide adjusting means operated by a vibratory action set up within'the drall hammer motor incident to the operation of the latter. Yet another object is to provide improved motor operated mechanism embodying selectively operable means operable at will alter'- nately for adjusting the hammer motor guide relative to its support and for feeding the hammer motor along said guide. A still further object is to provide an improved drill supporting, guiding and feeding means which embodies a guide on which the drill hammer motor is guided, and has improved motor operated means for feeding the hammer motor relative to the guide and for adjusting the guide relative to its support, and embodying means for locking an element of the feeding means relative to the guide support during -guide adjustment Still another object is to provide an improved means for .feeding the member to be fed and for adjusting the guide embodying a motor movable with the member to be fed relative to the guide during the feeding operation. These and other objects and advantages of the invention will, however, hereinafter more fully appear as the description proceeds. VThis application is a continuation-in-part of my copending application, Ser. No. 206,410, filed May 6, 1938, now matured into Patent, No. 2,268,573.

In the accompanying drawings there are shown for purposes of illustration two forms which the invention may assume in practice.

In these drawings:

Fig. l is a central longitudinally extending, vertical sectional view, with parts shown in elevation, of arcck drill constructed in accordance with one illustrative embodiment of the invention. f A

Fig. 2 is an enlarged detail vertical sectional view taken on line 2-2 of Fig. 1.

Fig. 3 is an enlarged cross sectional View taken on line 3-3 of Fig. l.

Fig. '4 is a detail cross sectional view taken on line 4-4 of Fig. 3.

Fig. 5 is a detail cross sectional view taken on line 5-5 of Fig. 3.

Fig. 6 is a View similar'to Figpl, showing another illustrative embodiment of the invention.

Fig. 'l is an enlarged cross sectional view taken on line 'l-l of Fig. 6, with parts shown in elevation.

Fig. 8 is an enlarged vertical sectional view taken substantially on line B--8 of Fig. 6.

In both illustrative embodiments of the invention the improved supporting, guiding and feeding means is shown associated with a drill hammer motor, generally designated I, herein of a conventional design, comprising a pressurefluid-actuated hammer piston 2 reciprocably mounted in a motor cylinder 3.- The hammer piston has a striking bar -4 adapted to deliver impact blows to the shank ofv a dril1`stee1 5 suitably supported within a'front chuck housing 6 secured to the front endof the motor cylinder. The rear end of the motor cylinder has secured thereto a rear head'block 1 having arranged thereon a conventional throttle valve mechanism 8 for controlling the supply of motive fluid to the motor cylinder foreflecting reciprocation of the hammer piston. As the construction and mode of operation of a drill hammer motor o-f the type disclosed are well known to those skilled in the art, further description thereof is herein unnecessary.

In the illustrative embodiment of the invention shown in Figs. l to 5, inclusive, a drill guide frame is generally designated 9 and is herein preferably in the form of an I-beam having lateral top flanges III, I0 providing longitudinal guides along which the drill hammer motor I is slidably guided, thehammer motor preferably vhaving longitudinal guideways II, II formed integral with the motor cylinder 3 and slidably engaging the guides I0. Engaging the bottom lateral flanges I2, I 2 of the guide frame is a trunnion support I3 having guideways I4 receiving the I-beam flanges I2 and provided with a bottom clamp I5, the latter adapted to be suitably adjusted by a clamp member I6 and cooperating clamping bolt Il to a column or bar, in a well ;adiustable to permit nion support. Manifestly, when the clamping bolts I9 are loosened, the guide frame 9 may be slid longitudinally Within the fguideways on" the trunnion support relative to the latter into any desired guiding position and thereafter firmlyry clamped in its adjusted position.

The feeding means operated by a vibratory action set up within the drill hammer motor-Tim" cident to the operation of the latter, in this illustrative construction, includes a circulatory control chain 20 having` its top and bottom, run portions respectively overlying and underlying the guide frame 9, and the control chain`is`arranged in vertical planes extending longitudinally of the I-beam midway between the sides bf 4the latter, in a manner shown in Fig. 2, and hasA its ends fastened at-,2 and. 22. respectivelyftdthe rear head block and the motor cylinder of the drill hammer motor-, The connection, of, 4the chain at 2| to the hammer motor is preierably Vtiglfitening of the. chain, and comprises a screw 23,-r eceived within a threaded opening in a lug 24` integral withy the rear head block and provided with a lock nut 215.. The connection, at 2,2r is permanent andno'nadjustable. The control chain isguidedlt. the forward endy of the. guide frame byk a vertical guide roll 26`- journaled onav bearing sleeve. sup.- ported by a transverse bolt 2.1. secured. to a bracket 2Q, herein attached by bolts tothe for.- Ward end of the I-beam, and is guided at. the rear end ofttheguidel frame by a vertical chain sprock,ettl.,formed` on a, horizontal. shaftv 3B. suitablyjournaled in a casing 3l. secured `to "theT I- beam. Arranged in thecasing 3| is a feedcontrol means, generally designated 32, for controllingl rotation of the cl'iainlsprocketr 2 9. The control .means 3.2 comprisesa rotatable ratchet ring 33 DQYidelwithL internal ratchet teeth 34l andl having its hub 35 keyed to. the shaft..33.(1!ig. 3)-, Arranged concentrcally within the ratchet ringv Iis ,a4 non-rotatable pawlv carrier '3E having a'stub shaftV 31 keyed to. a1 detachable cover. plate "38 offthecasing 3l. Thispawlzcarrer cariesre'- versible. spring-.pressedxpawls 3R and 4&1*` (Fig'sfi and5) engageablelwlththe vratchet teeth for coritrollng the.Y direction of rotation of? th-*chain .splSlCketa 29.,..andlforl attimes locking the chainl sprocketagainstrotation The pawls are herein preferably eight. in number, ffour .for controlling rotation. of. the sprocket in .one direction vand ifourjfor controlling. rotationirof the sproclttln theopposite direction. For.' selectively render' 'g the sets of pawls effective, a shiftefa'nriulsfjl is rotatably mounte'dwithinthe casing 3f! one circular projection integral withl the cover'plate 38 and this annulusiscut-away toprovidefr'ecesses or slots 42.`(Flg. `5) for'permitting'lthefpawls towmove into engagementwith the. ratchet Tte'eth, and the internal peripheral surface 43 of thelannulus ,is engageable with the pawls impressing the latter 'inward1y,.into their released position. .The shifter annulus is movable into an,I in't'eriiel diate position wherein "the recesses 42 permit botnsetslofypawls to move into engagement with the ratchet teeth, thereby tol lock` theratchet ring, and` consequently the` chain sprocket 29`, against rotation. i For moving the shifter annulus intoits different positions, a lever 44 is operatively; connected..to..the. shifter annulus. The chain known manner. The bolt I1 serves to tighten the clamp parts to secure the trunnion support to the column or bar. The top plates I8 of the guideways I4 are adapted to be tightened by bolts I9 for clamping the guide frame to the bottom trunsprocket 29, as shown most clearly in Fig. l, engages the control chain 2E, and the chain is adaptedto circulate relative to the sprocket. The trunnion support I5 has a longitudinal passage 4S extending therethrough beneath the bottom of the guide frame 9 (seeFig, 2), and the bottom portion et the control chain 2Q extends along the bottom of the I-'beam'tliroughV the passage 45. Mounted in a guiding recess 41 in the trunnion support is a reciprocable chain lock 4S havan operating screw 45 provided with an operating handle 5B.

This chain lock has projecting teeth El. 'adapted toiinterlock with links of the control chainZll' toflock the latter against movement relative yto the trunnion support. As the controlfrneans vfrully described in the cependin'g applicationaboye referred to, further description thereof is. unnecessary herein.

The, mode of loperation of the embodiment of the invention above described is as follows: The euideframe 9.` mayH beset unat thaworking. face by. clamping thetrunnon support l5 bythetrunnien clamp, LE on a baror, column, and the/.guide frame is. suitably clamped in, position by. the clamping plates I 8 adjusted by the bolts. Ml. When the guidetflame is in the desired. location and. theV chain.' lool; 4& is. released', the, operator may manipulate. the4 controt handle 44. ot. the shifter annulus 4 to moyethelatter. into a. po.- sition. wherein the rererse-feedl-.effeoting pawls are. (as shown in Figs. 4. and.; 51).. in engagement with the ratchet. teeth of; theratchet ring 33r` so that the control; sprocket. freev to. rotate. in a counterclockwisedirection. as. viewed. in Fig. 1, to permit 1?.10vle111er1-tof; the hammer. motor-rear.- Wardlyv along theguide. frame .and slide the ham;- mer. motor manually. to its. rearward. position. When the hammer motor isdn its rearmost posi.- tionon theguidefr e, the operatormayreverse thev position of the. shiftenannulus. 4l. to .render activev the forward-feed-eiecting pawls.. 40:, `and may then manipulatethe throttle: valve .mhanism 8i to effect the. supply .of .motive fluid to. the drilly hammer4 motor. to effect. operationofv the latter; thereby. to.actuatelpercussively the drill `steel 5;.. When, the. drill hammerv motor. is` running, and. the. drill; steel-A is percussively actuated; the

i reciprocatory. movement of the., hammer. piston causes.; due to.. the sudden. reversals.t in.. the r. di? rections.. ormovement. oft the,..plston, lvibratoryzor recoil movements.A of. the.l hammer motor.;l alter.,- nately. .in oppositedireetiens longitudinally. there.. of, resulting inyalternating tendenciestoftmove, ment, of the. hammerlnotoriorwardly.- and .rearwardlyJ with` respect; to.. the guidev frame. in'` the manner. well understood: by .those .skilled`l in the art.` Movement. ot..- tl:1e..hamrnerr motor.. in., the rearward direction. is checked; antomaticallyt by the ratchet andpawllmechanism, the..then.active pawls 4B.A engagin'gthe ratchet teeth-tantomencallyi checking.. reverse., rotation of. the chain sprocket- 2-9 while .permitting thechaincsprocket to.. rotate. freely. in. a...forwardsfeedfeffectingi .die rectiom When the .shiftersannulus4l1 is/inv a position opposite that shown in Fig. 5, the-control .sprocketawill zbe.l free. .torotatenamlock- Wlsedirecton asviewedin Eig, 1. 'FheNibratiQns set. upwithin '.thethammer. motor .incident l tothe operation thereof will then effect, thiouglhsthc control-chain .20 ,E rotation ofthe; control'. sprocket, andasaresult .the hammer motor a.wilt be. fedfstep by step along thetguide frame-insa tforwardnfeed. lng direction. Reverse rotation-oflthe.. control sprocketzfis.checkedautomatieallybythe.pawls 4u1.engagmg,.the.teeth.ot.the .ratchet :r1-fle..v thereby to prevent rotation of the control sprocket in a counter-clockwise direction as viewed in Fig. 1. It will thus be seen that as the hammer piston of the hammer motor reciprocates within the motor cylinder, with .the shifter annulus` in the position opposite that of Fig. 5, the control .sprocket is free to rotate in a forward-feed-elfecting direction due to the jars set up by the hammer'piston, the active pawls releasing automatically to permit free rotation of the control sprocketin the forward-feed-efiecting direction andy to check automatically rotation of the control sprocket in the reverse direction.

The guide frame 9 may also be adjustedrelative to the trunnion support by the same vibraf tory action of the hammer motor as that which effects hammer motor feed, simply by releasing the clamping plates IB for the guide frame and connecting the chain lock 48 to hold the control chain 20 stationary relative to the trunnionsupport I3. v The vibrations set up within the hammer motor incident to the operation thereof then effect, through the control chain 20, rotation of the control sprocket in the desired direction, the

shifter annulus 4| having been appropriately positioned; and as a result the guide frame is automatically fed in the desired direction relative to the trunnion support. When the guide frame is in the desired adjusted position with respect to the trunnion support, the operator may clamp the same in adjusted position by tightening the bolts I9 of the clamping plates IB. The guidel frame is stationary with respect to the trunnion support during normal feeding of the hammer motor along the guide frame. that under the control of the shifter annulus of the control means, the hammer motor and guide frame may be fed at the operators will in either of opposite directions relative to the trunnion support. y

In the modification of the invention shownv in Figs. 6 t0 8 inclusive, instead of utilizing the vibratory action of the hammer motor, an independent motor is provided for effecting hammer motor feed and guide adjustment. In this modifled construction the hammer motor, the adjustable guide and trunnion support are similar to those above described. A feed chain 55 has its It is accordingly evident r top land bottom run portions respectively over- I lying and underlying the guide frame 9, and, as

in the form of the invention above described, the chain is arranged in vertical planes extending longitudinally of the I-beam midway between the sides of the latterin the manner shown in Fig. 8. The ends of the feed chain are fastened at 56 and 51 respectively to the opposite ends of the trunnion support I3, as shown in Fig. 6, and the connection at 56 is adjustable to permit tightenngof the controlchain, While the connection at 51 is permanent. The feed chain is guided at the forward end of the guide frame by a vertical guide roll 58 journaled on the bearing sleeve supported by the transverse bolt 21 secured to the bracket 28 attached to the forward end of the I-beam, and is guided at the rear end of the guide frame by a vertical guide roll 59 journaled on a similar bracket attached to the rear end of the I-bearn.I Herein, preferably formed integral with the rear head block 1 of the hammer motor, is a casing 60 on which is mounted an independent motor 6I. This motor is of a conventional pressure-fluid-actuated type and has a chain sprocket 62 fixed to its power shaft 63. The chain sprocket 62, as shown most clearly in Fig. 6, engages the feed chain 55, and guide rolls 64, journaled on parallel horizontal shafts 65 supported by the casing 60, guide the chain through the open bottom of the casing and relative to the chain sprocket. A clamp 66, ad-

justed by a bolt 61, is mounted on the drill hammer motor, as shown'in Figs. 6 and 8, and this clamp is adjustable to lock the hammer moto-r against longitudinal movement relative to the guide frame. The motor 6I is of a conventional reversible type and is provided with a` reversing valve mechanism having an operating handle 58.

The mode o-f operation of this embodiment of the invention is relatively similar to that above described, with the primary exception that, in this instance, the jars yset up within the hammer motor are not employed to effect feed of the hammer motor and adjustment of the guide. In this construction, when the parts are in the position shown in Fig. 6, and the guide frame 3 is held against longitudinal adjustment relative to the trunnion support I3 by the clamp I8, and the clamp 55 for the hammer motor is released, the motor 6I may be operated to effect rotation of the feed sprocket 62 relative to the then stationary feed chain 55, thereby to effect feed iof the drill hammer motor in either of opposite directions along the guide frame. When the hammer motor clamp 66 is applied to hold the hammer motor against movement relative to the guide frame and the guide frame clamp I8 is released, the motor 6I ,may be operated to effect rotation of the feed sprocket 62, thereby to actuate the feed chain 55 Ito effect adjustment of the' guide frame along its guideways relative to the trunnion support. Otherwise this embodiment of the invention is similarv to that above described.

As a result of this invention, it will be noted that an improved rock drill supporting, guiding and feeding means is provided whereby the drill hammer motor may be supported, guided and fed in an improved manner. It will further be noted that by the provision of the adjustable supporting and guiding means for the drill hammer motor a relatively long range of feed is yobtained while a relatively compact supporting and guiding structure is retained. It will further be noted that by the provision of the drill feeding means operated by the motor wihich moves along the guide kwith the member to be fed, the member to be fed may not only be fed automatically along its guidey but also the guide may be adjusted automatically into different drill guiding positions. Other uses and advantages of theinvention will be clearly apparent to those skilled in the art.

While there are in this application specifically described tWo forms which the invention may assume in practice,'it will be understood that these forms cf the same are shown for purposes of illustration and that the invention may be Imodied and embodied in various other forms Without departing from its spirit or the scope :of the appended claims. "65

What I claim as new and desire to secure by Letters Patent is:

1. In combination, a support, a guide mounted on said support for adjustment in a longitudinal vdirection relative thereto, a member to be fed guided on said guide for feeding movement longitudinally vtherealong, and motor operated mechanism mounted on said guide for longitudinal movement therewith and including selectively operable means operable at will alternatively for adjusting saidguide relative to said support and `operable' means operable at will for adjusting said guide relative` to said support and for feeding said member to be )fed along said' guide, said means, including a motor rotated element common to and turning during both member-feed and) guide-adjustment and said' mechanismincluding means for holding said guideV against movement with respect to said ysupport to effect feeding of said member to be fed along saidi guide by said mechanism.

3. In combination,l a support, a guidej'vm-ounted onv said support for adjustment in a longitudinal direction relative thereto, a member to fed guided on said guide for feeding movement therealong, and motor operated mechanism for adjusin'g said, guide relative to said support and for feeding said member to be fed along said guide, said' mechanism. including a motor rotated element common to and turning during both member-feed and guide-adjustment and rel'easab'le locking means for holding said guide stationary with respect to said support to effect feedingl of said member to be fed by said mechanism. 4.. In combination, a support, a guide mounted on said support for adjustment' in a longitudinal direction relative thereto, a member to be fed guided on said guide for feeding movement -thereal`ong, and motor operated mechanism for adjusting said guide relative to said support and for feeding said member to be fed alongsaid guide, said mechanism including releasable locking. means yfor holding said guide stationary with respect to said. support to eiect feeding of said member to be fed by saidv mechanism and f'or holding. said member to be fed against movement with. respect to said guide to effect adjustment ofthe latter by said mechanism.

5.. In` combination, a. supper-t,v a* guide mounted on said `support for adjustment inV a longitudinal direction relative thereto, a hammermotor guided on said guide for feeding movement longitudinfally therealong, a motor mounted on said guide for movementlongitudinally relative thereto with said hammer motor, and mechanism operated byl said second mentioned motor alternatively ior adjusting said guide relative to. said support and' for feeding: said hammer motor along said guide.. i i

6. In' combination, a support, a guide mounted on said support for adjustment in a longitudinal direction relative i thereto; a: `hammer motor guided on said guide for/feeding movement longitudinally therealong, a motor mountedron said guide for movement longitudinallt relative thiere- `towith said hammer motor,v mechansmoperated by said secondV mentioned motor' for' ad- .justin'g said: guide relative to saidsupport and for? feeding. said hammer motor along said guide, andra releasable lock for vholding said guide. stationary with respect` tof said; support tof-eflect feeding of said. hammer motor along` said. guide by said mechanism 7.` Incombination, a-f support, ai guide mounted on. said :rapporty for adjustment in a longitudinal direction relative thereto, a hammer motor guided on said guide for feeding movement longitudinally therealong, a motor mounted on said guide;y and mechanism operated byA saidlast mentioned. motor for adjusting said Vguide relative to saidisupport and: for feeding said hammer mntor allume' said said mechanism includ Inga releannbie lock for holding said hammer mntor stationary withi, respect kto said guide to 'elect 'adjustment of: the latter relative'to said support by said mechanism.`

8. In combination, a support providing a longltndinal; gindew'aya, a: guide mounted on' said support'guideway for adslu'strnent` inta* longitudinal direction relative thereto; a memberv tot befed guided: o'nL said"I guide for feeding movement lon'- git'udi'nally th'eiealong,r and. motor' operated mechanism mounted on saidz guide for adjusting the/ latter relative to saidf support and: for feeding saidf member to fedalong. saidguide; saidlmecnanism including a: flexible element guided on said guide. a. rotatable. element cooperating with said fleinnzlle'` element; motor4 operiated means fini rotating said rotatable? element, and" means for vlocking said ilexibie element against movementv with respect iioy said support to effect adjustment-oi saidguide alonlg'r said support guidewayl by' saidl mechanism, said.` locking means being releasable tol free said flexible ele'- ment'for movement with respect to'fs'aid support during-member-feed.

9E In combination, a support, a'guide' mounted on said; support/"for adjustmentin a longitudinal direction relative thereto; a member to be' fed guidedV on said guide for' feeding movement tnerealong'; andmotor operated mechanism for adjusting said' guide relativei tosaldi support' and for feedingsaid member to' be fed along said guide, said mechanism including a exile element operative-ly connected to said member to red`r and guided for circulation relative to said" guide and' said; support; selectively operable means cooperating with said exible element and operable at will for effectingA selective operation oi said" gui'de-adjusting and member-feeding mechanism; and releasa'ble4 means for locking said flexible'l element to said: support to effect 'guide adjustment by said mechanism.

10'; In' combination, a support, a guide mounted" on said" support for adjustment in a longitudinali' direction relative-thereto, a membut. to be fed guided on" said guide forfeeding 'movement thereaibn'g, and motor operated mechanism for adjusting, said' guide relative to sain;l support. and for' feeding, said member to be red. along, said guidel said mechanism includmg afiiexiile. element operativel'y. connectedto said `member;to kiefedand guided for circulation relative to said. guide and saidisupport,V selectively operable.- means.` cooperating, withsaid flexible element andi operablev at will# for'l eiecting selective. operatiomof said.,guide-adjustingA andmem be1.--feecl.ing.- mechanism, and. releasable means lfor. loolsilzigA saidiexible. elementV to saidsupport v to'eieotguidejadjustment by said-mecha-nism,

movement therealong, a motor mounted on said guide for movement longitudinally with said member to be fed relative to the guide, and mechanism operated by said motor for adjusting said guide relative to said support and for feeding said member to be fed along said guide, said mechanism including a flexible element operatively guided for circulation relative to said guide and said support, selectively operable means cooperating with said flexible element andoperable at will for effecting selective operation of said guide-adjusting and member-feeding mechanism, and releasable means for locking said flexible element to said support to effect guide adjustment by said mechanism.

12. In combination, a support, a guide mounted on said support for adjustment in a longitudinal direction relative thereto, a member to be fed guided on said guide for feeding movement therealong, a motor mounted on said guide for movement longitudinally with said member to be fed relative to the guide, and mechanism operated by said motor for adjusting said guide relative to said support and for feeding said member to be fed along said guide, said mechanism including a flexible element operatively connected to said member to be fed and guided for circulation relative to said guide and said support, selectively operable means cooperating with said flexible element and operable at will for effecting selective operation of said guideadjusting and member-feeding mechanism, and releasable means for locking said exible element to said support to effect guide adjustment by said mechanism, said releasable means ncluding a manually operable lock mounted on said support and adjustable relative to the support into locking engagement with said ilexible element.

13. In a rock drill, the combination comprising a support, a guide mounted on said support for adjustment in a longitudinal direction relative thereto, a drilling implement to befed guided on said guide for feeding movement longitudinally therealong, a motor mounted on said guide for movement longitudinally with said drilling implement relative thereto, and mechanism operated by said motor and including selectively operable means operable'at will alternatively for adjusting said guide relative to said support and for feeding said drilling implement relative to said guide, said means including a motor rotated element common to and turning during both implement feed and vguide-adjustment. v

14. In a rock drill, the combination comprising a. support, a guide mounted on said support for adjustment in a longitudinal direction relative thereto, a drilling implement to be fed guided on said guide for feeding movement longitudinally therealong, a motor mounted on said connected to said member to be fed andy guide for movement longitudinally with said drilling implement relative thereto, mechanism operated by said motor and including selectively operable means operable at will for adjusting said guide relative to said support and for feeding said drilling implement relative to said guide, said means including a motor rotated element comm-on to and turning during both implement feed and guide-adjustment, and means for holding said guide against movement with respect to said support to effect feedingof said drilling implement relative to said guide by said mechanism.

15. In a rock drill, the combination comprising a support, a guide mounted on said support for adjustment in a longitudinal direction relative thereto, a drilling implement to be fed guided on said guide for feeding movement longitudinally therealong, a motor mounted on said guide for movement longitudinally with said drilling implement relative thereto, mechanism operated by said motor and including selectively operable means operable at will for adjusting said guide relative to said support and for feeding said drilling implement relative to said guide, said feeding and guide adjusting mechanism including a flexible element guided for circulation relative to said guide and said support, and means for locking said flexible element to said support to effect adjustment of said guide relative to said support by said mechanism.

16. In a rock drill, the combination comprising a support, a guide mounted on said support for adjustment in a longitudinal direction relative thereto, a drilling implement to be fed guided on said guide for feeding movement longitudinally therealong, a motor `mounted on said guide for movement longitudinally with said drilling implement relative thereto, mechanism operated by said motor and including selectively operable means operable at will for adjusting said guide relative to said support and for feedind said drilling implement relative to said guide, andmeans for holding said drilling implement against movement longitudinally with respect to said guide to effect adjustment of said guide relative to said support by said mechanism.

17. In combination, a support, a guide mounted on said support for adjustment in a longitudinal direction relative thereto, a member to be fed guided on said guide for feeding movement longitudinally therealong, and motor operated mechanism mounted on said guide for longitudinal movement therewith and including selectively operable means operable at will alternatively for adjusting said guide relative to said support and for feeding said member to be fed along said guide, said mechanism including a motor rotated elemen-t on said guide common to guide-adjustment and member-feed and turning during both of the same.y

CHARLES F. OSGOOD. 

